A Phase-Shift-Modulated LLC-Resonant Micro-Inverter Based on Fixed Frequency Predictive-MPPT

Abdel‐Rahim, Omar; Alamir, Nehmedo; Abdelrahem, Mohamed; Orabi, Mohamed; Kennel, Ralph; Ismeil, Mohamed A.

doi:10.3390/en13061460

Cited by 12 publications

(8 citation statements)

References 40 publications

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“…This model is called a digital observer, which can efficiently linearize the PV source model in the vicinity of the MPP [46]. Therefore, the design procedure of the fixed switching MPPT method can be performed following these steps [49,50] : 1. The predicted PV currents are calculated from…”

Section: Fixed Switching Frequency Mppt-based Digital Observermentioning

confidence: 99%

Maximum Power Point Tracking-Based Model Predictive Control for Photovoltaic Systems: Investigation and New Perspective

Ahmed

Harbi

Kennel

et al. 2022

Sensors

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In this paper, a comparative review for maximum power point tracking (MPPT) techniques based on model predictive control (MPC) is presented in the first part. Generally, the implementation methods of MPPT-based MPC can be categorized into the fixed switching technique and the variable switching one. On one side, the fixed switching method uses a digital observer for the photovoltaic (PV) model to predict the optimal control parameter (voltage or current). Later, this parameter is compared with the measured value, and a proportional–integral (PI) controller is employed to get the duty cycle command. On the other side, the variable switching algorithm relies on the discrete-time model of the utilized converter to generate the switching signal without the need for modulators. In this regard, new perspectives are inspired by the MPC technique to implement both methods (fixed and variable switching), where a simple procedure is used to eliminate the PI controller in the fixed switching method. Furthermore, a direct realization technique for the variable switching method is suggested, in which the discretization of the converter’s model is not required. This, in turn, simplifies the application of MPPT-based MPC to other converters. Furthermore, a reduced sensor count is accomplished. All conventional and proposed methods are compared using experimental results under different static and dynamic operating conditions.

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Section: Fixed Switching Frequency Mppt-based Digital Observermentioning

confidence: 99%

Maximum Power Point Tracking-Based Model Predictive Control for Photovoltaic Systems: Investigation and New Perspective

Ahmed

Harbi

Kennel

et al. 2022

Sensors

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“…The control technique consists of a MPPT-loop control, a second loop that synchronizes the grid current to the grid voltage, and a three-loop differential peak current control. The paper [ 32 ] presents a two stage microinverter with LLC resonant converter. The control technique consists of a MPPT based a fixed-frequency model predictive control and a PI control.…”

Section: Control Strategiesmentioning

confidence: 99%

“…The paper [ 32 ] presents a two stage microinverter with LLC resonant converter. The control technique consists of a MPPT based a fixed-frequency model predictive control and a PI control.…”

Section: Control Strategiesmentioning

confidence: 99%

Review of Control Techniques in Microinverters

Rojas

Muñoz

Rivera

et al. 2021

Sensors

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The use of renewable energies sources is taking great importance due to the high demand for electricity and the decrease in the use of fossil fuels worldwide. In this context, electricity generation through photovoltaic panels is gaining a lot of interest due to the reduction in installation costs and the rapid advance of the development of new technologies. To minimize or reduce the negative impact of partial shading or mismatches of photovoltaic panels, many researchers have proposed four configurations that depend on the power ranges and the application. The microinverter is a promising solution in photovoltaic systems, due to its high efficiency of Maximum Power Point Tracking and high flexibility. However, there are several challenges to improve microinverter’s reliability and conversion efficiency that depend on the proper control design and the power converter design. This paper presents a review of different control strategies in microinverters for different applications. The control strategies are described and compared based on stability, dynamic response, topologies, and control objectives. One of the most important results showed that there is little research regarding the stability and robustness analysis of the reviewed control strategies.

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“…Furthermore, a PI controller is employed to obtain the duty cycle command, which increases the tuning efforts. A very similar technique is implemented for the boost converter in [17] and for LLC resonant converter in [18].…”

Section: Introductionmentioning

confidence: 99%

Predictive Fixed Switching Maximum Power Point Tracking Algorithm with Dual Adaptive Step-Size for PV Systems

et al. 2021

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Maximum power point tracking (MPPT) is an essential and primary objective in photovoltaic (PV) systems implementation. Thus, in this article, the predictive fixed switching MPPT technique is proposed for a two-stage PV system, where the system under consideration consists of a PV source, boost converter, and two-level inverter. The MPPT design is based on dual adaptive step-size realization to limit the duty cycle oscillations at a steady state. Furthermore, the PI controller is eliminated, which simplifies the MPPT implementation. The suggested tuning procedure of the duty cycle is compared with the conventional adaptive step-size perturb and observe (P&O) method. The inverter is controlled using an efficient finite-set model predictive control (FS-MPC) algorithm with reduced computation burden, where the optimal switching state vector is identified based on the polarity of the reference voltage in the α-β reference frame and without any need for sector determination. Furthermore, the cost function of the FS-MPC algorithm is modified to include the reduction of the switching frequency as a secondary objective for the inverter control. The overall control methodology is evaluated using experimental results at different operating conditions.

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A Phase-Shift-Modulated LLC-Resonant Micro-Inverter Based on Fixed Frequency Predictive-MPPT

Cited by 12 publications

References 40 publications

Maximum Power Point Tracking-Based Model Predictive Control for Photovoltaic Systems: Investigation and New Perspective

Maximum Power Point Tracking-Based Model Predictive Control for Photovoltaic Systems: Investigation and New Perspective

Review of Control Techniques in Microinverters

Predictive Fixed Switching Maximum Power Point Tracking Algorithm with Dual Adaptive Step-Size for PV Systems

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